Additional properties are not allowed ('snippetPreviewFontSize' was unexpected)

[MRYingLEE]

Describe the bug
An error happened when Jupyterlab was launched.

Expected behavior
No error should be expected in launching.

Desktop (please complete the following information):

• OS: [e.g. iOS] Unbuntu (Windows Subsystem for Linux)
• Browser [e.g. chrome, safari]
• Version [e.g. 22] Windows 11

Additional context
Add any other context about the problem here.

Anaconda3-2023.03
JupyterLab 3.6.2

[W 2023-03-28 21:08:36.720 LabApp] The extension "jupyterlab-code-snippets" is outdated.

[I 2023-03-28 21:08:36.886 LabApp] Build is up to date
[W 2023-03-28 21:08:37.449 LabApp] Failed validating settings (jupyterlab-code-snippets:snippets): Additional properties are not allowed ('snippetPreviewFontSize' was unexpected)

Failed validating 'additionalProperties' in schema:
    {'additionalProperties': False,
     'definitions': {'snippet': {'properties': {'code': {'type': 'array'},
                                                'description': {'type': 'string'},
                                                'id': {'type': 'number'},
                                                'language': {'type': 'string'},
                                                'name': {'type': 'string'},
                                                'tags': {'type': 'array'}},
                                 'required': ['id', 'name', 'language'],
                                 'type': 'object'}},
     'description': 'Code Snippet Manager Settings',
     'jupyter.lab.setting-icon': 'custom-ui-components:codeSnippetIcon',
     'jupyter.lab.setting-icon-label': 'Code Snippet',
     'jupyter.lab.shortcuts': [{'command': 'codeSnippet:save-as-snippet',
                                'keys': ['Accel Shift A'],
                                'selector': '.jp-Notebook'},
                               {'command': 'codeSnippet:save-as-snippet',
                                'keys': ['Accel Shift A'],
                                'selector': '.jp-FileEditor'}],
     'properties': {'snippets': {'default': [{'code': ['import '
                                                       'matplotlib.pyplot '
                                                       'as plt',
                                                       'import numpy as np',
                                                       '',
                                                       'x = np.linspace(0, '
                                                       '10, 100)',
                                                       '',
                                                       'plt.plot(x, '
                                                       'np.sin(x))',
                                                       'plt.plot(x, '
                                                       'np.cos(x))',
                                                       '',
                                                       'plt.show()'],
                                              'description': 'Plotting '
                                                             'code for '
                                                             'sine graph '
                                                             'using '
                                                             'matplotlib.',
                                              'id': 0,
                                              'language': 'Python',
                                              'name': 'Plotting_sine',
                                              'tags': ['plot']},
                                             {'code': ['import numpy as np',
                                                       'import scipy',
                                                       'import pandas as '
                                                       'pd',
                                                       'import '
                                                       'matplotlib.pyplot '
                                                       'as plt',
                                                       'import seaborn as '
                                                       'sns'],
                                              'description': 'Import '
                                                             'useful '
                                                             'packages for '
                                                             'data '
                                                             'analytics',
                                              'id': 1,
                                              'language': 'Python',
                                              'name': 'Importing packages '
                                                      'for data analytics',
                                              'tags': ['data analytics']},
                                             {'code': ['import keras',
                                                       'import sklearn',
                                                       'import torch',
                                                       'import tensorflow '
                                                       'as tf'],
                                              'description': 'Import '
                                                             'useful '
                                                             'packages for '
                                                             'machine '
                                                             'learning',
                                              'id': 2,
                                              'language': 'Python',
                                              'name': 'Importing packages '
                                                      'for machine '
                                                      'learning',
                                              'tags': ['machine '
                                                       'learning']}],
                                 'description': 'The list of snippets.',
                                 'items': {'$ref': '#/definitions/snippet'},
                                 'title': 'Code Snippets',
                                 'type': 'array'}},
     'title': 'Code Snippet Manager',
     'type': 'object',
     'version': '1.0.0'}

On instance:
    {'snippetPreviewFontSize': 3}